[Hakon]

The other thing here is mental ability. I think that Orcs lack the mental ability to control their own will when the ring is near. Hobbits are like Humans they can control their will if they try. We see Boromir give in to his will for the Ring but before he dies he is in control again. If an Orc found the ring they would instantly be taken over by the power of it and most likely end up dead very soon. Any Orcs near the Orc with the Ring would most likely attack the one with the Ring.